Type-writing machine.



G. H. SHEPARD.

TYPE WRITING MACHINE.

APPLICATION FILED 0011a, 1904.

1,032,087. Patented July 9, 1912.

2 BHEETHHEBT 1.

v ITNEEEEE:

Z/M/ ymw l5 ATTORNEY G. H. SHEPARD.

TYPE WRITING MACHINE.

APPLIOATION FILED 001218, 1904.

1 ,032,087. Patented July 9, 1912.

2 SHEETS-SHEET 2.

WITNESSES: INVENTUR V M 647% Ma.

UNITED sraa rls Pig-rum OFFICE.

owns 11, seam-an, or :aaooxnr'n, new Yonx; A ssIGNoR T WYCKOFF, SEAMANS & BENED ICT, 0F ILION, YORK, A CORPORATION OF NEW YORK.

mn'wmmwe mounts.

Specification of Letters Patent.

. Patented Julyf),1913.

Applioafiol me. October is; i904. Serial No. 228,985. r

To all whom it may concern 7 Be it'k'nown that I, CHARLES H. 'Smcmun, citizenof the United States, and resident of the borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improv'e ments in Type-Writing Machines, of. which the following is a specification.

My invention relates .to typewritmg ma chines and it has for its object to provide an improved escapement mechanism.

My invention-consists in certain features of construction and combinations and ar rangcments of parts which will be hereinafter fully set forth and particularly in Fig. 2, the parts being shown in the positiomthey occupy at the end of the down stroke of a key; Fig. 4 is a View similar to Fig. 3 but showing the parts in normal position; Fig. 5 is a view showing the escapement wheel in elevation and in plan; Fig. 6 is a top plan view showing the parts in ,the position shown in'hig. 3; Fig. 7 is :2.

similar view showing the parts in normal position; and Fig. 8 is a detail. View hrstrating a preferred form of one of the parts.

My invention is applicable to typewriting machines generally and also to other ma chines in which a step-by-step escapement mechanism is used.

In the present instance I have illustrated my inventionas applied to 9. Remington typewriter. The main frame of this machine comprises a base portion 1 from which rise posts 2, which support a type ring 3. The keys 4. are mounted on key levers 5, which are pivoted at. their rear ends and which are connected by links with ty e bars 7 in a manner well-known iii. the A universal bar 8 lies beneath the system of key levers, being suspended by links 9.

which are connected at their upper ends with spreading arms 10, which are fixed to and form parts of a lever arm ll, which projects toward the front of the machine from a rock shaft 12, having an arm 13 projecting upward therefrom and having the feed (loss mounted thereon. lhis is'the wellknown dog rocker of the Remington machine. So far as my invention is concerned, the dogs might be mounted on any to and fro moving part and the word rocker, as used in the claims, is to be understood as referring to any such part having the feed dogs mounted thereon. The rocker isrooked forward by the uni versal bar and is rocked backward by a spring 14 (Fig. 2) which is coiled about the shaft 12 and which is connected at one end to said shaft and at the other end to a fixed portion of the machine. The motion of the rocker under the impulse of this spring is adjustably limited by a set screw 15, which is threaded through the arm 11 and engages a portion of a bracket 16 on which the dog rocker is pivoted. Motion of the rocker in the other direction is adjustably limited by a set screw l7,' 'which is threaded through the arm 1?, and the end of which is adapted to engage the bracket 16. The shaft 12 is. pivoted at its ends on coned pivot pins 18, which extend through suitable openings in cars 19, which project from the bracket 16, and said pins are secured in posil ion by set screws 20. A platen 21 (Fig. ll is mounted on a carriage which is adapted to move across the machine and which is drawn across the machine by the usual spring drum. Said carriage has mounted thereon a rack which meshes with a pinion, 'whichis iixcd on the forward end of a shaft, which is journaled in the framework and which has mounted thereon an escapement wheel The construction and arrangement of the carriage and connected devices are well-known'in the art and it has not been thought necessary to show them in the present case. So'far as my invention is concerned, these parts may have any suitable construction, and furthermore, escapemeni rack need not be a wheel geared to the carriage but said rack may be in the form. a rack bar mounted on said carriage.

16%;}, dog: or stopping dog 23 is pivoted on arm of the (log rocker by a pin 2% P-5g. 33. The stepping dog is mounted in a guiding slot in the arm '13, as shown in Figs. 6 and and said dog is normally 7 pressed by a tooth of the escapement wheel into engagement with an adjustable stop 25 which as here shown, consists of'a set screw threaded through the arm 13 and secured in the adjusted position by a lock nut 96. When the stepping dog is freed from the escapement rack, as shown in Figs. 3 and (5, itis pressed back into position to engage the next succeeding tooth of the wheel, as shown in Fig. 6, by a fiat spring 27 which is secured to the side of the arm 13 by a screw 28 and which presses against a portion of the dog whi'ch extends below the pivot pin 24. As shown in Fig. 2 the upper end 29 of said sprin is bent away from the arm 13 and extends above the pivot pin- 24and serves to limit the backward motion of the stepping dog when freed from the escape: ment wheel, thus preventing said dog from 'moving sofar as not to be struck by the neXt succeeding tooth of the wheel. A holding dog 30 is mounted in a slot in the rear side of'the arm 13 in which it is pivoted on a pin 31. A spring 32 secured to the side of the arm 13 by a screw 33, engages a portion of the holding dog and presses it toward the escapement wheel, its motion in this direction being normally limited, as shown in Fig. 4, by the engagement of said dog with a portion of the arm 13.

As best shown in Figs. 6 and 7, the holding dog 30 has a notch 34 in its upper end, and this notch stands in position to receive one. of the teeth of the escapement wheel when the rocker is moved toward the front of the machine. The form of this notch is such that one wall thereof holds the escapement wheel against turning and the other wall thereof engaging the face of the escapement wheel arrests the holding dog against further motion into engagement with said wheel, as best shown in Fig. 3. After the holding dog has engaged the es capement wheel, any further forward n10- tion of the rocker results in turning about its pivot 31 sion of thespring 32. An arm 35 having an inclined face projects from the holding dog into position to be engaged by the stepping dog when said stepping dog is free from the escapement wheel and is thrown back by its spring 27. In the present instance the arm is shown as part of a bracket which is secured to the holding dog by screw 36. hen the stepping dog is first freed from the escapement wheel it moves back into engagement with the arm 35, and any further forward motion of the rocker results in said dog slipping over the inclined face of the arm, and being pressed into engagcment with said arm by the spring 27. When the key is released and the dog rocker starts on its return motion, the stepping dog ongaging the inclined face of the arm 35 presscsthe holding dog out of engagement with the escapement wheel immediately, the parts on the dog rocker being held in the relative position shown in Fig. 3, by the engagement of the stepping dog with the said holding dog. against the ten-' arm When the stepping dog is struck by the next succeeding tooth of the escapement wheel it is thrown to its normal position shown in Fig. 7, and'is'thus disengaged from the arm 35 and the holding dog is then restored to its normal position by its spring 32.

In order to prevent the stepping dog from slipping along the surface of the arm 35 durin the return motion of the dog rocker, one edge of the stepping dog is concaved as shown at 37 in Figs. 6 and 7. If preferred, the arm 35-may be formed with fine teeth 38 as shown in Fig. 8 (to prevent the step ping dog from slipping along said arm. 'It will be perceived that when the holding dog is arrested in its forward motion by the escapement wheel any further forward motionof the dog rocker results in the stepping dog being moved farther away from the holding dog. It may happen that the distance between these dogs will become greater than the thickness of the escapement wheel. in which case, unless the dog rocker moved back toward its normal position very rapidly,

more than one tooth of the escapement wheel might pass between the two dogs before the stepping dog got into position to arrest the wheel. In order to prevent this, a safety dog 39 is rigidlymounted on the arm 13 by means of a screw 40. As will be understood by reference to Figs. 3, 6 and'7 this safety dog stands in such position that after any tooth of the escapement wheel has been released from the holding dog, such tooth will be caught by the safety dog and held by said safety dog until the stepping dog has moved in position to arrest the next succeeding tootln In the resent instance, 1 have shown both the ho ding dog and the safety dog beveled. This construction may be employed or not, as desired.

The universal bar which operates the dog rocker is in osition to be operated by any one of anumher of keys; and unless the relation of each of these keys to the universal bar is accurately adjusted, some of said keys will move said universal bar and the dog rocker greater distances than others. In escapements as heretofore constructed, a key that moves the rocker a comparatively short distance will release the escapement Wheel earlier in its up stroke than one that moves said rocker a greater distance. It will be perceived that the construction of my escapement mechanism is such that the esca ment wheel will bereleased at substantia ffy the same point on the up stroke of one key as of another, even thoughthe different keys may not be very accurately adjusted with relation to the universal bar. the construction being such that when the dog rocker begins its return motion the holding dog immediately begins to move our. of engagement with the escapement wheel whether the dog rm" has moved a greater or less distance on its forward stroke. The notch 34 is made shallow, so that every key releases the escapement wheel when such key has moved but a short distance on its up stroke.

The dog rocker may be equipped with the usual arm 41 pivoted thereto at 42 and controlled b a spring 43 for the purpose of locking the escapemcnt wheel against backward rotation when the carriage is moved toward the right or when the carriage release mechanism is operated, and also with the usual arm 44 which forms part of the line-lock mechanism ordinaril employed in the Remington typewriter. n the present construction the stop screw 17 may be dis- )ensed with altogether if desired, as no harm is done in this escamment mechanism by throwing the dog rodker too far forward.

Various changes may be made-in the dctails of construction and arrangement without departing from the gist of my improvements.

It will be perceived that the holding do and the step ing dog are movable toward and from each other in the direction of the motion of the dog rocker and that means are provided for movin the holdin dog out of engagement with t to rack at su stantially the same point in the upstroke of any key, whether the several keys have been accuratel adjusted with reference to the universal ar or not; and also that a safety dog is provided to arrest the rack in case a tooth thereof escapes between the other two dogs. An escapemcnt embodying these features is not claimed in its broadest as ect in this apilication but is claimed broa ly in my prior atent No. 953,440, dated March 29th, 1910.

What I claim as new and desire to secure by Letters Patent, is

1. In escapemcnt mechanism, the combination with a feed rack, of a stepping dog and a holding dog which alternately engage said rack, and means for temporarily causing a direct mechanical connection between said dogs whereby said dogs are caused to start together on the return stroke of the parts.

2. In an escapemcnt. mechanism, the combination with the feed rack, of a holding dog mounted for motion transversel of said feed rack, a dog rocker mounte for motion transversely of said feed rack, a stepping dog mounted on said dog rocker, an means operative when said stepping dog is freed from said rack for temporarily mechanically connecting said stepping dog directly with said holding dog, whereby said dogs are caused to start together on the return stroke of the parts.

3. In an escapemcnt mechanism, the combination with the feed rack, of a holding dog movable into and out of engagement with said feed rack, means for limiting the motion of said holding dog into engagement with said rack, a steppin dog mounted to engage said rack alternately with said holding do", and means for temporarily vmechanically connecting said steppin" dog directly with said holding dog when said stepping dog is disengaged from said rack, whereby said dogs are caused to start together on the return stroke of the parts.

4. In escapemcnt mechanism, the combination with an escapen'ient rack, of a dog rocker, a holding dog and a stepping dog, means for arresting said holding dog on the forward stroke of said rocker before said rocker completes said forward stroke, and means for temporaril causing a direct mechanical connection between said dogs to cause said do s to move together during the first part of the return stroke of said rocker.

5. In an escapemcnt mechanism, the combination with the feed rack, of a dog ro'cker, a stepping dog and a holding dog cooperatin with said rack, means for arresting said ho ding do before said rocker has completed its fiirward stroke, and an arm on said holding dog adapted to be engaged by said stepping dog whereby said holding dog is caused to move in unison with said stepping dog during the first part of the return motion of said rocker.

6. In an escapemcnt mechanism, the combination with tie feed rack, of a stepping dog and the holding dog which alternately engage said feed rack, and a toothed member mounted on one of said dogs and adapted to be engaged by the other of said dogs when the stepping dog is freed from the feed rack whereby said stepping dog and said holding dog are caused to start together on the return stroke of the parts.

7. In an esca )ement mechanism, the combination with t ie feed rack, of a dog rocker, a holding dog pivotally mounted on said dog rocker, a spring pressing said holding (log toward said feed rack, means for limiting the forward motion of said holding do a stepping dog mounted on said dog roclier, ant a member mounted on one of said dogs and adapted to be engaged by the other when said stepping dog 18 freed from the rack whereby said stepping dog and said holding dog are caused to move together during the first part of the return motion of said rocker.

8. In an escapemcnt mechanism, the combination with the feed rack, of a holding dog and a stepping dog which alternately engage said rack, means for limiting the motion of said holding dog into engagement with said feed rack, and an arm mounted on said holding dog and having an inclined face which is engaged by said stepping dog when said stepping dog freed from the feed rack and whereby said stepping dog and said holding dog are caused to move together during the first partof the return motion of the parts. 9. In an escapement meehanism,thecombination with the feed rack of-a" Stepping dog and aholding dog which alternately engage said rack, means whereby. the forwar'd motion of said holding dog is arrested by said feed raclc, an arm on one of said dogs having. an inclined face which is engaged by the other ofs'aiddogs when said stepping dog is freed from the rack whereby said stepping dog-and said holding dog are caused to move together during vthe-first partofiits return motion.

10. In. the escapement mechanism of a typewrit-ing machine, the combination with a feed. rack, of a stepping dog and a holding-dog mounted to move together and independently one of the other transversely of ---sa1d feed rack, and means for temporarily causing a direct mechanical connection between saiddogs whereby said dogs are .caused to start together onthe return stroke of the parts.

. Signed at the borough of Manhattan, city of'New York, in the counti Copies of this patent may be obtained for five gents each, by addressing the Commissioner of Patents.

Washington, D. C.

is 17th day 0% a 

